help VNC free Edition 4.1

Mike Miller mbmiller+l at
Wed Oct 12 20:28:13 BST 2011

On Wed, 12 Oct 2011, Yang, Yihong wrote:

> Out situation is that the people in lab will create several sessions on 
> the server, and they will use viewer to access their own sessions. Once 
> we create the sessions on the server, the server will give you a number 
> based on the order of the creation, right? So the server will give you 
> session 1, session 2 and so on.
> The problem is that if we create two sessions on the server, there is no 
> problem for us to use viewer to access those two sessions. But if we 
> create more than three sessions, only the first and the second sessions 
> can be accessed by using viewer.
> I don't know how to fix it. Do you know how to fix this?

It might be because some ports are occupied by other processes.  I had 
this problem once with ssh port forwarding using port 6010, and this made 
it so that vnc on :10, which uses port 5910 and 6010, would not work.

Have you used netstat to see which ports are being used by other services 
on the server?  I would look into that.

Have you tried adding some sessions with higher port numbers?  That is, 
don't just except the default :1, :2, :3, etc, but specify :51, :74, or 

Another question:  Whos sessions are these?  Are they all created by the 
same user?  Some window managers, such as Gnome, will not reliably allow 
more than one VNC session.


More information about the VNC-List mailing list